### Extra dimensions – and how to hide them

How many dimensions does the world have? The answer, it seems, is obvious: Space has three dimensions. One indication is that, to define a location in space, we need exactly three numbers - for instance geographic latitude and longitude as well as height ...

### Hunting for extra dimensions

It is impossible to picture how a world with more than three space dimensions would look like. There would be additional spatial directions, complementing the well-known threesome of up-down, left-right, forward-backward. But when it comes to picturing these ...

### The embedded universe

Could our world possess extra spatial dimensions - and if yes, why do we only see three of them in everyday life? This question is not as far-fetched as it might sound - there are some candidates for a theory of quantum gravity, notably string theory, in ...